Log Message:
py-ipython: updated to 7.12.0

IPython 7.12 is a minor update that mostly brings code cleanup, removal of
longtime deprecated function and a couple update to documentation cleanup as well.

Notable changes are the following:
- Exit non-zero when ipython is given a file path to run that doesn't exist
- Test PR on ARM64 with Travis-CI
- Update CI to work with latest Pytest
- Add infrastructure to run ipykernel eventloop via trio
- Support git blame ignore revs
- Start multi-line ``__repr__`` s on their own line